Wave-changer system



1931- A. M. TROGNER WAVE CHANGER SYSTEM Filed Feb. 11. 1929 2 Sheets-Sheet l IN V ENTOR.

Feb. 24, 1931. I TRQGNER 1,794,262

WAVE CHANGER SYSTEM Filed Feb. 11, 1929 2 Sheets-Sheet 2 INVENTOR. fl/rmwz/ 9V6, @zgqmv,

BY I 1 E A TTORNEY Patented Feb. 24, 1931 UNITEDSTATES PATENT OFFICE ARTHUR M. TROGNER, OF EAST ORANGE, NEW JERSEY, ASSIGNCR, BY MESNE ASSIGN- MENTS, TO FEDERAL TELEGRAPH COMPANY, A CORPORATION OF CALIFORNIA WAVE-CHANGER SYSTEM I Application filed. February 11, 1929. Serial No. 339,154.

This inve in general. relates to inductance arrangements employed in signaling systems. I

An object of this invention is to provide an inductance arrangement for signaling systems whereby the operating frequency of the signaling system may be readily changed.

Another object of this invention is to prontion relates to signaling systems vide an inductive coupling arrangement for signaling systems whereby the inductance of the entire inductive coupling arrangement may be varied simultaneously.

Still another object of this inyention is to provide means associated with the inductances of the tuned'circuits of signaling sys tems whereby the operating frequency of the signaling system may be readily varied from one predetermined value to another.

Other objects and features of this invention will be apparent to those skilled in the art to which this invention pertains from the following specification and the annexed claims.

In signal transmitting systems it is often desirable to change the operating frequency of the apparatus rapidly. Usually this is accomplished by changing the number of turns of inductance in the resonant circuits of the transmitting system. In this invention, I

provide means whereby both the inductance included in the resonant circuit and the coupling inductance are varied simultaneously.

This is highly desirable especially in trans mitting systems adapted for operation on widely separated frequencies as is now commonly done in high frequency signaling systerns.

According to this invention an inductance system comprising a plurality of concentrically mounted inductance coils is rotatably mounted with respect to a contacting arrangement. Arc shaped members are disposed upon portions of the outermost inductance. the are shaped members and interiorly disposed inductance units. The stationary contacting arrangement is provided with members for connecting selected ones of the are shaped members into circuit as the inductance system is rotated and as connections to dif- More specifically this invention Connections are provided between ferent portions of the outermost inductance are changed.

In the drawings Figure 1 shows a perspective view of an inductance system embodying this invention; Fig. 2 is across-sectional view along the line 22 of Fig. 3 of a modification of this invention and Fig. 3 is a sectional view along the line 33 of Fig. 2 of the inductance system in front elevation.

Referring to Fig. 1 of the drawing in detail, reference numeral 1 designates an in ductance supporting frame having end pieces 2.and 3 andlongitudinally disposed across pieces 4, 5 and 6. Rotatable member 7 is supported by the end pieces 2 and 3. Inductance frames 8 and 9 are supported upon the rotatable member 7 Contacting members 10, 11 and 12 are ,"positioned upon the cross piece 4: which is of conducting material, such as brass, bronze gir copper, for engagement with the inductance turn engaging members 10' and 11'. Contacting members 13, 14, and 15 are positioned upon the cross piece 5, which is also of conducting material, for engagement with members similar to 13 and 14' which are positioned uponthe turns of the inductance winding supported by the frame 8. A bar member 16 is attached to the end piece 2. Contacting members 17, 18 and metallic strap 23 and the inductance mount-' ed upon the frame 9 is provided. Members 24, 25 and 26 are positioned upon, the strap 23 at positions suchthat the contacting member 28 which is mounted upon the metallic bar member 27 will engage member 24 when contacting member 18 engages member 18",

- contacting member 28 will engage member 25 engages 17 and member 26 when I when 17 I bers 17 a at each end of the inductance frame 61.

frequency. of

19 engages to the frame 1. A scale having graduations A, B, C which designate the wave length or operation for particular settings of the inductances may 'also be pro vided.

In Fig. 2 a modification of this invention ada ted for use in a symmetrical electron. disc arge device circiut arrangement, such for example as a push-pull amplifier circuit, is illustrated. In this modification conducting bar members 51 and 52 corresponding to member 16 of Fig. 1 are attached to the end pieces 53 and 54 of the inductance system mounti'ng frame. Strap members 55, 56, 57 and v 58, 59, 60 corresponding to strap mem- 18' and19of Fig. 1 are provided onnections 63, 64,65 and 66, 67, 68 are provided between the members 55, 56, 57 and 58, 59, 60

and selected points on inductance 7 3 respectively. Bar members 51 and 52 are provided with contacting members 55', 56, 57 and 58', 59', 60, respectively for engaging projecting members attached to strap members 55, 56, 57 and58, 59, 60, respectively. Bar member 69 is attached to the end piece 53. Con-. tacting member 7 0 is positioned upon the bar 69 for engaging projecting members positioned u on the conducting strap 71. A connection 2 is provided and the mid turn of the inductance 73.

In Fig. 3 a cross-sectional view in elevation'of the modification illustrated in Fig. 2, is shown. In operation the bar members 74, 7 5 and 76 correspond to members 4, 5 and 6 of Fig.1. Contacting members 74', 7 5' and 7 6' for enga 'ng inductance turn engaging members 7 4" 5" and 7 6" respectively are positioned upon the bar members. Conducting bar member 52 is attached to the end piece 54 for supporting contacting members. similar to 60' for successively engaging the projecting members 58, 59' and 60' which are positioned upon the strap members 58, 59 and 60. Conducting bar member 77 is also supported by the end piece 54 of the inductance frame. C ontacting member 78 is positioned upon the bar 77 for successively engaging turn engaging members on the inductance mounted on frame 61. I

The operation of the inductance arrange ment comprising this invention is best understood by a reference toFig. 1 of the drawing. By way of illustration an inductance system having only three settings A, B and C is shown. More settings may be employed if desired and if a greater number of operating which is mounted upon ing members 10' between the strap 71 front frequencies are desirable. When the indica tor 32, which may be a pointer as shown or a frequency calibrated dial, is set upon a certain setting, of the contacting members as 10, 13, 19, 28 and 31 are in engagement with turn select- 13', 19", 26 and 29 respectively. When the indicator is turned to position B different portions ofthe inductances mounted on frames 8 and 9 will be included in circuit since the same or difierent contacting members are in engagement with different turn selecting members.

Connections between the signal transmit ting system and the inductances are established through conductors D, E, F, G, H and I attached to bar members 4, 5, 6,16, 27 and 30, respectively.

While I have described my invention in.

some of its preferred embodiments I realize that modifications thereof may be made, it is therefore understood that the embodiments of my invention are not to be limited in scope to the foregoing specification and drawing but only as defined by the annexed clalms.

What I claim as new and desire to secure by Letters Patent of the United States is as follows: 1. In a wave changing system for high frequency signaling system the combination of a plurality of inductance units, one of which surrounds another thereof, contacting memas A for example, certain onesbers'positioned with respect to said induce tance units and means connected to the turns of said inductance unitsfor engaging-said contacting members, said inductances being coaxially disposed with respect to each other.

2. In a wave changing system for high frequency signaling systems the combination of a plurality of inductance units, one of which surrounds another thereof, contacting members positioned. with respect to said inductance-units, means connected to certain turns of the inductance units for engaging said,

contacting members, and means or rotating/said inductance units being coaxially disposed.

3. In an'inductance system 0 scribed, the'combination of a plurality of concentrically disposed inductance units, one

:of which surrounds another thereof, mounted upon a rotatable member, contacting members mounted upon members stationary with respect to said inductance units and means connected to certain turns of said inductance units for engaging said contactin members.

4. In an inductance system of t e class de .scribed, the combination of a plurality of concentrically disposed inductance units, one of which surrounds another thereof, mounts ed upon a rotatable member, contacts connected to selected turns of said units, contacting members for en aging said contacts, said contacting members belng positioned upon a plurality of members longitudiinductance units, said inductance f the class dc.

ARTHUR M. TROGNER. 

